Regulating valve with pre-starting type structure

Abstract

The invention relates to the technical field of valves, and particularly discloses a pre-opening type structure regulating valve which comprises a valve body shell and a valve cover, the valve cover is fixed to the upper end of the valve body shell through bolts, a water inlet is formed in one end of the valve body shell in an upwards-inclined mode, and a water outlet is formed in the other end of the valve body shell in a downwards-inclined mode. A second cavity is formed in the inner end of the water inlet, a first cavity is formed in the inner end of the water outlet, and the first cavity is communicated with the second cavity. Elements for controlling fluid flow in the pre-starting valve rod assembly are fixedly connected instead of movably connected in a traditional structure, so that the problem of fluctuation of operating parameters is solved; the main sealing pair and the pilot sealing pair adopt metal hard sealing instead of a sealing ring, so that the valve is scouring-resistant and wear-free, the sealing reliability of the valve is greatly improved, and the service life of the valve is greatly prolonged; most unbalanced force is balanced, the valve is easy to operate, and the required output force of the actuator is greatly reduced, so that the cost of purchasing the actuator is reduced, and meanwhile, the energy consumption of the valve is also reduced.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a pre-starting structure regulating valve. Background Art

[0002] Valves are control components in pipeline fluid delivery systems. They are used to change the cross-section of the passage and the flow direction of the medium. They have functions such as diversion, cutoff, throttling, non-return, diversion or overflow pressure relief. At present, the pre-start regulating valve in the industry often experiences flow or pressure fluctuations during operation. This is because the components that control flow or pressure in the traditional pre-start valve stem assembly structure are active and vibrate under the disturbance of the fluid, causing instability in the flow area of ​​the medium and resulting in fluctuations in the controlled parameters. Even in the case of a small opening, the active parts will produce high-frequency collisions with the valve seat and generate sharp noises, which can seriously damage the sealing surface and fail to seal effectively. Summary of the invention

[0003] The purpose of the present invention is to provide a pre-start structure regulating valve to solve the problem that the valve in the above-mentioned background technology vibrates under the disturbance of the fluid, thereby causing instability in the flow area of ​​the medium, resulting in fluctuations in the controlled parameters, and even in the case of a small opening, the moving parts will produce high-frequency collisions with the valve seat and generate sharp noises, which seriously cause damage to the sealing surface and cannot be effectively sealed.

[0004] To achieve the above object, the present invention provides the following technical solution: a pre-starting structure regulating valve, comprising: a valve body shell and a valve cover, the valve cover is fixed to the upper end of the valve body shell by bolts, one end of the valve body shell is inclined upwardly and provided with a water inlet, the other end of the valve body shell is inclined downwardly and provided with a water outlet, the inner end of the water inlet is provided with a second cavity, the inner end of the water outlet is provided with a first cavity, and the first cavity is connected to the second cavity; A valve cage is fixedly installed in the second cavity, and a plurality of water inlet holes are evenly opened on the valve cage. A valve seat is fixedly installed on the upper end of the first cavity, and the lower end of the valve cage abuts against the upper end of the valve seat. A pre-starting valve stem assembly is slidably connected in the valve cage. The pre-start valve stem assembly includes a valve stem, a valve disc cover, a valve disc outer tube and a valve disc. The upper end of the valve stem passes through the valve cover, the lower end of the valve stem is fixedly connected to the upper end of the valve disc cover, the valve disc outer tube is fixedly sleeved on the outer side of the valve disc cover, the valve disc is located at the lower end of the valve disc cover and on the inner side of the valve disc outer tube, and the upper end of the valve disc and the lower end of the valve disc cover are elastically connected.

[0005] Preferably, a plurality of support rods are fixedly mounted on the upper end of the valve cover, a fixing seat is fixedly mounted on the upper end of the support rods, a through hole is provided in the middle of the fixing seat, and the upper end of the valve stem slides through the through hole.

[0006] Preferably, a threaded hole is provided at the upper end of the valve flap cover, a threaded groove is provided on the outer wall of the lower end of the valve stem, and the valve stem is threadedly connected to the upper end of the valve flap cover through the threaded hole and the threaded groove.

[0007] Preferably, a fixing hole inclined downward is opened on one side of the upper end of the valve flap cover, the fixing hole extends to the inner end of the valve stem, a fixing pin is inserted into the fixing hole, the front end of the fixing pin is located in the valve stem, and the fixing pin and the fixing hole are interference fit.

[0008] Preferably, a sealing head is provided in the middle of the lower end of the valve flap cover, and a flow groove is opened at the lower end of the valve flap cover. The flow groove is annular and located on the outside of the sealing head. A number of flow holes are evenly opened on the circumference of the side wall of the valve flap cover, and the lower end of the flow hole is connected to the flow groove.

[0009] Preferably, an external thread 1 is provided on the outer wall of the upper end of the valve flap cover, and an external thread is provided on the inner wall of the upper end of the valve flap outer tube. The valve flap outer tube is threadedly connected to the outer end of the valve flap cover through external thread 1 and external thread 2 and welded and fixed. A step groove 1 is provided on the circumference of the inner wall of the valve flap outer tube, and a slide groove is vertically provided at one end of the valve flap outer tube.

[0010] Preferably, a mounting groove is provided at the upper end of the valve flap, the mounting groove is in a circular ring shape, a groove is provided at the lower end of the valve flap, a water channel is provided at the center of the valve flap, the upper end of the water channel passes through the upper end of the valve flap, the lower end of the water channel is connected to the groove, a step groove two is provided on the circumference of the outer wall of the upper end of the valve flap, and a plug-in groove is provided on the side wall of one end of the valve flap.

[0011] Preferably, the valve flap is inserted into the inner side of the valve flap outer tube, the step groove one and the step groove two can engage with each other, a limit key is inserted into the plug-in groove, the outer end of the limit key is located on the outer side of the plug-in groove, and is slidably inserted into the slide groove.

[0012] Preferably, a butterfly spring is fixedly installed in the installation groove, a butterfly spring is also fixedly installed at the inner end of the give way groove, and an adjustment pad is fixedly installed between the two groups of butterfly springs, and the size of the adjustment pad is smaller than the maximum inner diameter of the installation groove.

[0013] Preferably, a circular hole is provided in the middle of the adjusting pad and the butterfly spring, the size of the circular hole is larger than the minimum inner diameter of the mounting groove, and a plurality of water flow holes are provided on the circumference of the outer wall of the adjusting pad, and the inner ends of the water flow holes are connected to the circular holes.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The element that controls the fluid flow in the pre-start valve stem assembly (valve disc outer cylinder) adopts a fixed connection instead of a movable connection in the traditional structure, which solves the problem of operating parameter fluctuations; 2. The main seal pair and pilot seal pair adopt metal hard seal, without sealing ring, which is resistant to erosion and wear, greatly improving the reliability and service life of valve seal; 3. Most of the unbalanced forces are balanced, the valve is easy to operate, and the required actuator output force is greatly reduced, thereby reducing the cost of purchasing actuators and also reducing the energy consumption of the valve; 4. The pre-start valve stem assembly of this valve body is interchangeable with the traditional valve stem assembly, which reduces the maintenance cost for users. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a left view of the overall structure of the present invention; Figure 2 It is a right view of the overall structure of the present invention; Figure 3 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 4 It is a schematic diagram of the structure of the pre-start valve stem assembly of the present invention; Figure 5 A bottom view of the pre-start valve stem assembly of the present invention; Figure 6 It is a cross-sectional schematic diagram of the pre-start valve stem assembly of the present invention; Figure 7 A schematic diagram of the explosion structure of the pre-start valve stem assembly of the present invention; Figure 8 This is a second schematic diagram of the explosion structure of the pre-start valve stem assembly of the present invention.

[0016] In the figure: 1. valve body shell; 2. valve cover; 3. water inlet; 4. water outlet; 5. cavity one; 6. valve seat; 7. cavity two; 8. valve cage; 9. water inlet hole; 10. valve stem; 11. support rod; 12. fixed seat; 13. valve disc cover; 14. flow hole; 15. fixing hole; 16. fixing pin; 17. plugging head; 18. flow groove; 19. external thread one; 20. valve disc outer tube; 21. external thread two; 22. step groove one; 23. slide groove; 24. valve disc; 25. groove; 26. waterway; 27. step groove two; 28. plug-in groove; 29. ​​installation groove; 30. adjustment pad; 31. water flow hole; 32. butterfly spring; 33. round hole; 34. limit key; 35. interlaced hole; 36. threaded hole. DETAILED DESCRIPTION

[0017] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 8 The present invention provides a technical solution: a pre-start structure regulating valve, comprising: a valve body shell 1 and a valve cover 2, the valve cover 2 is fixed to the upper end of the valve body shell 1 by bolts, the valve cover 2 is also an important pressure-bearing part, on the one hand, it forms a fluid-enclosed area with the valve body, and on the other hand, it provides a channel for the disassembly and assembly of valve internals, one end of the valve body shell 1 is inclined upward to be provided with a water inlet 3, the other end of the valve body shell 1 is inclined downward to be provided with a water outlet 4, the inner end of the water inlet 3 is provided with a cavity 2 7, the inner end of the water outlet 4 is provided with a cavity 1 5, the upper end of the cavity 1 5 is connected with the lower end of the cavity 2 7, so that the water inlet 3 and the water outlet 4 are connected, so that the liquid can enter the water outlet 4 from the water inlet 3 at the valve body shell 1 and be discharged.

[0019] A valve cage 8 is fixedly installed in the cavity 2 7, and a plurality of water inlet holes 9 are evenly opened on the valve cage 8. The valve cage 8 is a control element for the fluid flow characteristics. The water inlet holes 9 on the valve cage 8 can be designed according to linear adjustment characteristics, equal percentage adjustment characteristics, quick opening adjustment characteristics, etc. to meet different working conditions. At the same time, the valve cage 8 also guides the movement of the pre-start valve stem assembly to ensure the smooth movement of the pre-start valve stem assembly. A valve seat 6 is fixedly installed on the upper end of the cavity 1 5. The valve seat 6 is the main sealing element and is connected to the valve disc 24 constitutes a main sealing pair to achieve tight closure of the valve. The lower end of the valve cage 8 and the upper end of the valve seat 6 abut against each other to seal the connection between the valve cage 8 and the valve seat 6. The liquid in the cavity 2 7 can enter the valve cage 8 through the water inlet hole 9, and then flow through the valve seat 6 into the cavity 1 5. A pre-starting valve stem assembly is slidably connected in the valve cage 8. On the one hand, the pre-starting valve stem assembly balances most of the unbalanced forces, and on the other hand, forms a main sealing pair with the valve seat 6. A pre-starting sealing pair is arranged inside the valve cage 8 to ensure the tightness of the valve closure.

[0020] The pre-start valve stem assembly includes a valve stem 10, a valve disc cover 13, a valve disc outer tube 20 and a valve disc 24. The upper end of the valve stem 10 passes through the valve cover 2. A plurality of support rods 11 are fixedly installed on the upper end of the valve cover 2. A fixing seat 12 is fixedly installed on the upper end of the support rod 11. The fixing seat 12 is fixed by the support rod 11. An insertion hole 35 is opened in the middle of the fixing seat 12. The upper end of the valve stem 10 slides through the insertion hole 35 to guide and limit the valve stem 10. The valve stem 10 mainly transmits the thrust output by the actuator to realize the up and down movement of the entire valve stem assembly.

[0021] The lower end of the valve stem 10 is fixedly connected to the upper end of the valve flap cover 13. A threaded hole 36 is provided at the upper end of the valve flap cover 13. A threaded groove is provided on the outer wall of the lower end of the valve stem 10. The valve stem 10 is threadedly connected to the upper end of the valve flap cover 13 through the threaded hole 36 and the threaded groove. The valve stem 10 is threadedly connected to the upper end of the valve flap cover 13 by screwing the valve stem 10. A downwardly inclined fixing hole 15 is provided on one side of the upper end of the valve flap cover 13. The fixing hole 15 extends to the inner end of the valve stem 10. A fixing pin 16 is inserted into the fixing hole 15. The front end of the fixing pin 16 is located in the valve stem 10. The fixing pin 16 and the fixing hole 15 are interference fit, which further fixes the valve stem 10 and the valve flap cover 13 together to prevent the valve stem 10 from falling off from the upper end of the valve flap cover 13.

[0022] The valve disc outer tube 20 is fixedly sleeved on the outer side of the valve disc cover 13. A plugging head 17 is arranged in the middle of the lower end of the valve disc cover 13. A flow groove 18 is opened at the lower end of the valve disc cover 13. The flow groove 18 is annular and located on the outer side of the plugging head 17. A plurality of flow holes 14 are evenly opened on the circumference of the side wall of the valve disc cover 13. The lower end of the flow hole 14 is connected with the flow groove 18. The liquid enters the valve cage 8 through the water inlet hole 9 and then enters the flow groove 18 through the flow hole 14. An external thread 19 is opened on the outer wall of the upper end of the valve disc cover 13. An external thread is provided on the inner wall of the upper end of the valve disc outer tube 20, and the valve disc outer tube 20 is threadedly connected to the outer end of the valve disc cover 13 through an external thread 19 and an external thread 21 and welded and fixed. A step groove 22 is provided on the circumference of the inner wall of the valve disc outer tube 20, and a slide groove 23 is vertically provided at one end of the valve disc outer tube 20 to fix the valve disc outer tube 20 to the outside of the valve disc cover 13. A step groove 22 is provided on the circumference of the inner wall of the valve disc outer tube 20, and a slide groove 23 is vertically provided at one end of the valve disc outer tube 20. The outer wall of the valve disc outer tube 20 and the inner wall of the valve cage 8 are slidably connected.

[0023] The valve disc 24 is located at the lower end of the valve disc cover 13 and at the inner side of the valve disc outer tube 20. The upper end of the valve disc 24 is elastically connected to the lower end of the valve disc cover 13. The upper end of the valve disc 24 is provided with a mounting groove 29, which is annular. The lower end of the valve disc 24 is provided with a groove 25. The center of the valve disc 24 is provided with a water channel 26. The upper end of the water channel 26 passes through the upper end of the valve disc 24. The lower end of the water channel 26 is connected to the groove 25. The liquid entering the flow groove 18 can flow into the groove 25 through the water channel 26, and then flow into the water outlet 4 through the groove 25, so that a first liquid is formed between the valve disc cover 13 and the valve disc 24. The guide sealing pair realizes the effect of balancing the unbalanced force. The circumference of the outer wall of the upper end of the valve disc 24 is provided with a step groove 27, and a plug-in groove 28 is provided on the side wall of one end of the valve disc 24. The valve disc 24 is plugged into the inner side of the valve disc outer tube 20. The step groove 1 22 and the step groove 27 can bite each other to prevent the valve disc 24 from falling from the valve disc outer tube 20. A limit key 34 is inserted in the plug-in groove 28. The outer end of the limit key 34 is located on the outside of the plug-in groove 28 and is slidably inserted into the slide groove 23. The limit key 34 is installed between the valve disc 24 and the valve disc outer tube 20 to prevent the valve disc 24 from rotating under medium disturbance.

[0024] A butterfly spring 32 is fixedly installed in the mounting groove 29, and a butterfly spring 32 is also fixedly installed at the inner end of the yield groove. An adjusting pad 30 is fixedly installed between the two sets of butterfly springs 32. The size of the adjusting pad 30 is smaller than the maximum inner diameter of the mounting groove 29. A circular hole 33 is provided in the middle of the adjusting pad 30 and the butterfly spring 32. The size of the circular hole 33 is larger than the minimum inner diameter of the mounting groove 29. A plurality of water flow holes 31 are provided on the circumference of the outer wall of the adjusting pad 30. The inner end of the water flow hole 31 is connected to the circular hole 33. When the valve stem 10 drives the valve flap cover 13 to move downward, the valve flap cover 13 moves downward with the valve flap outer tube 20 and the valve flap 24. The valve flap 24 contacts the valve seat 6 during the downward movement, and the valve stem 10 continues to drive the valve flap cover 13. The valve disc cover 13 moves downward, and continues to move downward by squeezing the butterfly spring 32, pressing the adjusting pad 30 into the installation groove 29. At the same time, the sealing head 17 and the upper port of the water channel 26 are in conflict with each other to seal the pilot sealing pair. The butterfly spring 32 provides sufficient elastic force during the valve opening process to ensure that the pre-start sealing pair opens first to balance most of the unbalanced force, and at the same time provides sufficient elastic force to prevent the valve disc 24 from vibrating up and down to ensure the stability of the pre-start valve stem assembly; the adjusting pad 30 is installed between the two groups of butterfly springs 32. On the one hand, it provides a pre-start flow channel, and on the other hand, it ensures that the butterfly spring 32 does not interfere with other parts during the deformation process, so as to ensure that the two sealing pairs can fit reliably and completely during the closing process.

[0025] When the valve is opened, the valve stem 10 moves in the opening direction under the action of external force, driving the valve disc cover 13 and the valve disc outer tube 20 to move together, while the valve disc 24 remains in position under the elastic force of the butterfly spring 32, and the pre-start sealing pair is gradually opened, and the pre-start channel inside the pre-start valve stem assembly is opened. At this time, the high-pressure closed area at the upper end of the pre-start valve stem assembly is connected with the low-pressure area at the lower end of the pre-start valve stem assembly, which quickly balances the unbalanced force at the upper end of the pre-start valve stem assembly, and the valve can be easily opened; the valve works in the middle position to adjust the fluid When controlling the parameters, since the upper and lower areas of the pre-start valve stem assembly are always in a connected state, the operation is easy, and the valve stem 10, the valve flap cover 13 and the valve flap outer tube 20 are fixedly connected, and there is no upper and lower vibration under the action of the medium, so the control parameters are stable; when the valve is closed, the sealing pair of the valve flap 24 and the valve seat 6 is closed first, and as the valve stem 10 continues to move in the closing direction, the pre-start sealing pair of the valve flap cover 13 and the valve flap 24 is gradually closed, and the high pressure generated in the closed area at the upper end of the pre-start valve stem assembly is more conducive to the sealing of the valve.

[0026] Specifically, the valve stem 10 mainly transmits the thrust output by the actuator to realize the up and down movement of the entire pre-start valve stem assembly; on the one hand, the valve flap cover 13 is connected to the valve stem 10 through a conical surface and a thread to realize the precise positioning and reliable connection of the valve stem 10, and also forms a fixed connection with the valve flap outer tube 20 to accurately control the flow of the fluid; on the other hand, the valve flap cover 13 and the valve flap 24 form a pilot sealing pair to achieve the effect of balancing the unbalanced force; the valve flap outer tube 20 is fixedly connected with the valve flap cover 13 and the valve stem 10, and driven by the up and down movement of the valve stem 10, the channel area on the valve cage 8 is accurately controlled, thereby controlling the flow of the fluid.

[0027] The up and down movement of the pre-start valve stem assembly controls the size of the channel area on the valve cage 8. The pre-start valve stem assembly in the present valve body mainly realizes that the elements that control the change of the fluid channel area are fixedly connected, rather than the movable connection in the traditional structure, thereby fundamentally solving the problem of unstable controlled parameters. The present valve body adopts a modular design for the pre-start valve stem assembly. The valve flap cover 13 and the valve flap outer tube 20 are detachable, which is convenient for installing the valve flap 24, the butterfly spring 32 and the adjustment pad 30; the step grooves on the valve flap outer tube 20 and the valve flap 24 ensure that the valve will not fall out during movement, and also limit the movement range of the valve flap 24. The butterfly spring 32 always provides a sufficiently large spring force to ensure that the valve flap 24 does not move up or down during operation, and also ensures that the pre-start sealing pair can be opened and closed normally.

[0028] In actual use, the valve disc cover 13, the valve cage 8 and the valve stem 10 assembly together form a closed area. After the high-pressure medium enters the valve body through the water inlet 3, the high-pressure medium quickly fills the closed area and acts on the upper end of the pre-start valve stem assembly, forming a large unbalanced force. When the valve is opened, the valve stem 10 moves in the opening direction under the action of external force, driving the valve disc cover 13 and the valve disc outer tube 20 to move together, while the valve disc 24 maintains its position unchanged under the elastic force of the butterfly spring 32, the pre-start sealing pair is gradually opened, and the pre-start channel inside the pre-start valve stem assembly is opened. At this time, the high-pressure closed area at the upper end of the pre-start valve stem assembly is connected to the low-pressure area at the lower end of the pre-start valve stem assembly. The unbalanced force at the upper end of the pre-start valve stem assembly is quickly balanced, and the valve can be easily opened; when the valve works in the middle position to adjust the fluid parameters, since the upper and lower areas of the pre-start valve stem assembly are always in a connected state, the operation is easy, and the valve stem 10, the valve flap cover 13 and the valve flap outer tube 20 are fixedly connected, and there is no upper and lower vibration under the action of the medium, so the control parameters are stable; when the valve is closed, the sealing pair of the valve flap 24 and the valve seat 6 is closed first, and as the valve stem 10 continues to move in the closing direction, the pre-start sealing pair of the valve flap cover 13 and the valve flap 24 is gradually closed, and the high pressure generated in the closed area at the upper end of the pre-start valve stem assembly is more conducive to the sealing of the valve.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pre-starting structure regulating valve, comprising: A valve body shell (1) and a valve cover (2), wherein the valve cover (2) is fixed to the upper end of the valve body shell (1) by bolts, and is characterized in that: one end of the valve body shell (1) is provided with a water inlet (3) inclined upward, and the other end of the valve body shell (1) is provided with a water outlet (4) inclined downward, a second cavity (7) is provided at the inner end of the water inlet (3), and a first cavity (5) is provided at the inner end of the water outlet (4), and the first cavity (5) and the second cavity (7) are communicated; A valve cage (8) is fixedly installed in the second cavity (7), and a plurality of water inlet holes (9) are evenly opened on the valve cage (8). A valve seat (6) is fixedly installed on the upper end of the first cavity (5), and the lower end of the valve cage (8) abuts against the upper end of the valve seat (6). A pre-starting valve stem assembly is slidably connected in the valve cage (8); The pre-start valve stem assembly comprises a valve stem (10), a valve disc cover (13), a valve disc outer tube (20) and a valve disc (24); the upper end of the valve stem (10) passes through the valve cover (2); the lower end of the valve stem (10) is fixedly connected to the upper end of the valve disc cover (13); the valve disc outer tube (20) is fixedly sleeved on the outer side of the valve disc cover (13); the valve disc (24) is located at the lower end of the valve disc cover (13) and at the inner side of the valve disc outer tube (20); the upper end of the valve disc (24) is elastically connected to the lower end of the valve disc cover (13).

2. A pre-starting structure regulating valve according to claim 1, characterized in that: A plurality of support rods (11) are fixedly mounted on the upper end of the valve cover (2), a fixing seat (12) is fixedly mounted on the upper end of the support rod (11), a through hole (35) is provided in the middle of the fixing seat (12), and the upper end of the valve stem (10) slides through the through hole (35).

3. The pre-starting structure regulating valve according to claim 1 is characterized in that: The upper end of the valve flap cover (13) is provided with a threaded hole (36), the lower end outer wall of the valve stem (10) is provided with a threaded groove, and the valve stem (10) is threadedly connected to the upper end of the valve flap cover (13) via the threaded hole (36) and the threaded groove.

4. The pre-starting structure regulating valve according to claim 1 is characterized in that: A fixing hole (15) inclined downward is formed on one side of the upper end of the valve flap cover (13), the fixing hole (15) extending to the inner end of the valve stem (10), a fixing pin (16) inserted into the fixing hole (15), the front end of the fixing pin (16) being located in the valve stem (10), and the fixing pin (16) and the fixing hole (15) being interference fit.

5. A pre-starting structure regulating valve according to claim 4, characterized in that: A plugging head (17) is provided at the middle of the lower end of the valve flap cover (13), a flow groove (18) is provided at the lower end of the valve flap cover (13), the flow groove (18) is annular, and the flow groove (18) is located outside the plugging head (17), and a plurality of flow holes (14) are evenly provided on the circumference of the side wall of the valve flap cover (13), and the lower ends of the flow holes (14) are connected to the flow groove (18).

6. The pre-starting structure regulating valve according to claim 1, characterized in that: The upper outer wall of the valve flap cover (13) is provided with an external thread 1 (19), and the upper inner wall of the valve flap outer tube (20) is provided with an external thread. The valve flap outer tube (20) is threadedly connected to the outer end of the valve flap cover (13) via the external thread 1 (19) and the external thread 2 (21) and is fixed by welding. The inner wall of the valve flap outer tube (20) is provided with a step groove 1 (22) on its circumference, and one end of the valve flap outer tube (20) is provided with a slide groove (23) in a vertical direction.

7. The pre-starting structure regulating valve according to claim 6, characterized in that: The upper end of the valve flap (24) is provided with a mounting groove (29), which is in a circular ring shape. The lower end of the valve flap (24) is provided with a groove (25). A water channel (26) is provided at the center of the valve flap (24), the upper end of the water channel (26) passes through the upper end of the valve flap (24), and the lower end of the water channel (26) is connected to the groove (25). A step groove (27) is provided on the circumference of the outer wall of the upper end of the valve flap (24), and a plug-in groove (28) is provided on the side wall of one end of the valve flap (24).

8. The pre-starting structure regulating valve according to claim 7, characterized in that: The valve flap (24) is inserted into the inner side of the valve flap outer tube (20), the step groove 1 (22) and the step groove 2 (27) can engage with each other, a limit key (34) is inserted into the insertion groove (28), the outer end of the limit key (34) is located outside the insertion groove (28), and is slidably inserted into the slide groove (23).

9. The pre-starting structure regulating valve according to claim 8, characterized in that: A butterfly spring (32) is fixedly installed in the installation groove (29), and a butterfly spring (32) is also fixedly installed at the inner end of the clearance groove. An adjustment pad (30) is fixedly installed between the two groups of butterfly springs (32), and the size of the adjustment pad (30) is smaller than the maximum inner diameter of the installation groove (29).

10. The pre-start structure regulating valve according to claim 9, characterized in that: A circular hole (33) is provided in the middle of the adjustment pad (30) and the butterfly spring (32), the size of the circular hole (33) is larger than the minimum inner diameter of the mounting groove (29), a plurality of water flow holes (31) are provided on the circumference of the outer wall of the adjustment pad (30), and the inner ends of the water flow holes (31) are connected to the circular hole (33).

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